There are iPod support modules but I don't think anything for non apple specifically.
PacAudio makes the device. It support AUX, but it comes fro the headphone jack of your music devices (that are non apple).
I had one, works well. Low on volume, but clean sounding. I don't use it now - I ended up replacing the HU instead.
I think the device is like $140. However without iPod integration, I think the AUX only device is cheaper but I don't remember for sure. It's been a couple years since I've been in the market.
Look them up, see what you can find.